Update free-courses-en.md (#7341)

* Update free-courses-en.md

* fix resource info

* lint: alphabetize

* lint: restore blank lines pre heading

* fix creators

Co-authored-by: Eric Hellman <eric@hellman.net>

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>
Co-authored-by: Eric Hellman <eric@hellman.net>

courses/free-courses-en.md

@@ -449,6 +449,7 @@
 * [Git & GitHub Tutorial for Beginners](https://www.youtube.com/playlist?list=PL4cUxeGkcC9goXbgTDQ0n_4TBzOO0ocPR) (The Net Ninja)
 * [Git and GitHub for Poets](https://www.youtube.com/playlist?list=PLRqwX-V7Uu6ZF9C0YMKuns9sLDzK6zoiV)
 * [GIT for beginners](https://www.eduonix.com/git-for-beginners) - Maksym Rudnyi (Eduonix Learning Solutions) *(account or email address required)*
+* [Git for Professionals Tutorial - Tools & Concepts for Mastering Version Control with Git](https://www.youtube.com/watch?v=Uszj_k0DGsg) - Tobias Günther (YouTube)
 * [Git How To](https://githowto.com) - Alexander Shvets
 * [Git Tutorial - Learn Command-line Git & GitHub](https://www.youtube.com/playlist?list=PLpcSpRrAaOarEpNz71TSfNVd0eQmsZSgN) - LearnWebCode (YouTube)
 * [Git Tutorial for Beginners: Learn Git in 1 Hour](https://www.youtube.com/watch?v=8JJ101D3knE) - Moshfegh Hamedani (Programming with Mosh)